Which of the following immune system cells is most severely depleted by HIV/AIDS ? Naim 10:40 AP Biology Which of the following immune system cells is most severely depleted by HIV/AIDS ? (A) Plasma B cells (B) Memory B cells (C) Helper T cells (D) Cytotoxic ("Killer") T cells (E) Memory T cells Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+